Piggybacking off my previous thread, I'm looking to pass MD inspection but throwing P0171 for Bank 1 running too lean. I've had PTuning and Park Ave Lotus take a crack at it, but no dice. The tech at PAL suggested a Kold-fire tune to modify the air flow and fix the problem, but he wasn't 100% confident that it would work. Does anyone have experience with this issue? Also, I saw a thread with lots of talk about Kold-fire vs. Gotham and I'm sure PTuning does some of this as well. What's the best option (not best bang for my buck, but best initial tune overall)?
Here's a picture of the reason I'm losing sleep at night:
Looking forward to any thoughts. For what it's worth, I did search here for a thread relating to Elise tunes first, but didn't find any. If I missed it, please redirect me and my apologies. Enjoy your Labor Days!
Assuming you don't have a leak in either the intake or exhaust and your O2 sensor and cat are fine, the intake will throw a code when the diameter at the MAF sensor isn't exactly like the OEM one. The ECU can correct a little, but it throws a code when the correction is more than 17%. This can happen if the diameter there is a little too large, air moves through there slower (but the same volume of air since the diameter is bigger), the ECU thinks less air is going in because of the lower speed, and then it gives less fuel than is really needed.
That's just more of an FYI, haha. To fix it, a tune will work (they just multiply the airflow by a value that gives the correct rate), or you can just slap the original back on long enough for it to reset and pass inspection. A third option is an intake that doesn't throw a code - my K&N works great.
Fantastic! Everything is mint under the hood. It does look like they increased the diameter without thinking to re-tune accordingly. When I went to Park Ave Lotus, I asked them to return it to stock, but they wouldn't do it. I may try the K&N solution since it's not that expensive but I was also liking the idea of increasing my performance overall with a tune. I suspect this hasn't been done since it first rolled through the show floor. Next step was going to be registering the car in Minnesota. Here's hoping it clears before it gets to that!
For the tuning route-- any preference or are they all fairly similar?
I'd go with BOE, and they probably have a canned tune for a stock car with the ITG intake. Give them a call and see what they suggest doing if you don't mind dealing with someone out of state (they can probably have you mail the ECU you, flash it, and mail it back). They have the best NA tune anyways, it seems.
That'll play. I shot them an e-mail Saturday morning. Hoping to connect with them today now that Labor Day is behind us. Looks like I can mail them the ECU or they can send me the SW program-- or both.